Sonos and Qobuz high rez

I been experimenting a bit with my little Sonos connect and various setups.  If I use it as an Roons endpoint and source Qobuz hi rez (24/96) you can clearly see the DSP converts to 16/44 and my DAC indicated 44khz. If I source the same song and use my iPad and Qobuz app and go directly to my DAC via USB the DAC indicates 96Khz.  If I use the Sonos app and go straight to Qobuz it still plays but not sure why.  The Sonos only handles redbook CD quality.  I suppose the conversion is being done at some stage in the chain?  If i look in QoBuz app I only see the high res version of the music I was streaming.   I remember a year or so ago when I tried to play Hi Rez through the Sonos app it just wouldn't play.  But now it do. :/